Device for cutting crooked screw-threads.



Patented Feb. 1, 1916.

QNoR-Ews R. ANDREWS.

DEVICE FOR CUTTING CROOKED SCREW THREADS. APPLICATION FILED MAR- 26. m3. RENEWED JUNE 25. 1915.

RICHARD ANDREWS, OF CHARLES TOVJN, VEST VIRGINIA,

TO OSCAR III. DABLINGTON, ONE-FOUR? GEORGE E. DIEHL, AND (ENE-FOURTH TOWN, WEST VIRGINIA.

ASSIGYNOR 0E ONE-FOUETH HUGHES, ONE-FOURTH T0 HOOFJF, ALL 01* CHARLES H T0 DANIEL S. T0 FONTAIN B.

DEVICE FOR CUTTING CROOKED SCREW-THREADS.

iii 9,13.

Application filed March 26, 1913,-Seria1 No.

To all whom it may concern:

Be it known that I, RICHARD ANDREWS, citizen of the United States, residing at Charles Town, in the county of Jetferson and State of ll est Virginia, have invented certain new and useful Improvements in Devices for Cutting Crooked Screw-Threads, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to device for cutting crooked. threads and has for its primary object to provide a simple and novel mean for easily and quickly adjusting the die carrying stock to angularly position the same with relation to the longitudinal axis of the pipe or rod to be threaded.

iinotl or and more specific object of the invention resides in the provision of a collar loosely mounted with an eccentric opening provided in the rear end of the die stock said collar also having an eccentric opening through which the pipe or rod is adapted to extend, and means mounted in the die stock and cooperating with said collar to securely hold the same in its adjusted posi tion with relation to the stock, whereby the stock, after the dies have been engaged upon the periphery of the pipe may be maintainer at the desired angle during the cutting of the threads A still further object of the invention is to produce a device for the above purpose which is simple in construction, reliable and durable in practical operation and may be produced at comparatively small manufacturing cost. 1

With the above and other objects in view as will become apparent as the description proceeds, the invention consists in certain constructions, combinations and arrangements of the parts that I shall hereinafter fully describe and claim.

For a full understanding of the invention, reference is to be had to the following description and accompanying drawing, in which Figure 1 is a longitudinal section of a thread cutting tool, partly in section, to which my invention is applied; Fig. 2 is an end elevation. Fig. 3 is a section taken on the line 3-3 of Fig. 1.

Referring in detail to the drawing, 5 designates a die stock which may be of any or- Specification of Letters Eatent.

llf atented Feb. 1, 1916.

757,005. Renewed June 25, 1815. Serial No. 36,383.

dinary or approved construction, the body thereof being provided at its rear end with an inturned flange 6. The inner wall of this flange is cocentrically related to the periphery of the stock body as indicated at 7 for a purpose which will be fully disclosed in the following description. For use in con junction with the die stock, I provide a collar 8 adapteo to be arranged within the eccentric opening 7 of the flange Upon one end of this collar, an annular flange 9 is formed a clearly shown in Fig. 1, and thisflange in its periphery is provided with a plurality of spaced cavities or sockets 9. These sockets are arranged in one half or 180 degrees of the circumferential extent of the collar flange. stock 5 adjacent to the flange 6 thereon, a plurality of holding screws 10 are threaded. l i hile I preferably employ three of these screws as shown in Fig. :2, it will be obvious that any desired number of the same may be used. An additional screw 11 is also threaded in the annular wall of the stock ho v and this latter screw is adapted for bindi g on gagement in any one of the sockets or recesses 9 provided in the periphery of the collar flange 9.

The collar 8 has an eccentric pipe receiving opening 12 formed in its body as clearly shown in Fig. 2. This collar is loosely mounted for adjustable rotative movement in the opening 7 f the flange 6 formed upon the body of the diestock, and for this purpose, the collar is provided upon its outer end face with a plurality of linger pieces 18 whereby the same may be readily turned. It will be observed from reference to Fig. 2 that theouter face of the inturned flange Q on the stock body is provided with graduations 14 extending through 180 degrees around the eccentric opening 7 in said flange. The face of the collar 8 has an indicating mark 15 thereon which is adapted to be registered with any one of the graduations upon the flange 6 by turning the collar within the opening '2' of said flange. As shown in Fig. 2, the collar is arranged for the cutting of a straight thread upon the periphery of a pipe or rod, the mark on said collar being registered with the zero graduation upon the flange 6.

When it is desired to cut a crooked thread upon the pipe, the collar 8 is turned by In the body of the die means of the finger pieces 13 to the right and the mark 15 thereon moved into registration with thedesired graduation mark upon the scale it will be obvious that in this turning movement of the collar 8,

on. It is of course, understood that after the collar has'been adjusted, the holding screw 11 is threaded inwardly into engagement with one 01 the sockets 9 in the collar liange, said sockets being equal in number to the degrees marked upon the face of the flange 6. The screws 10 are also threaded inwardly into engagement with the periphery of the pipe and prevent longitudinal movement inwardly oi the collar 8 in the stock body. These screws however, are spaced suiiiciently from the flange 9 oi the collar to permit of the easy turning movement oi said collar within thebody of the die stock.

From the foregoing, it is thought that the construction and manner of operation of my invention will be clearly and fully understood. The same resides primarily in the provision of the collar adjustably mount ed. in the eccentric opening of the stock body whereby either a straight or crooked thread may be out upon the pipe or rod. These. collars may be provided with pipe receiving openings of various sizes upon which the threading tool is capable of operating.

My invention is applicable to all pipe threading tools now known in the art without necessitating any material alterations in their construction.

As the device is extremely simple, it will beobvious that the same can be manufactured at small costand'may also be easily and quickly applied in position for use and readily adjusted within the stock body to properly dispose the stock at the desired inclination with relation to the axis. of the pipe or red.

While I have above disclosed the preferred form and construction of the several elements employed, it will be understood that the same are susceptible of considerable modificationwithout departing from the es senti'al features or sacrilicin any of the advantages of the invention. 7 Having thus described the invention, what is claimed is: v

1. The combination with a die stock, of a collar provided with a pipe receiving open ing, said collar being eccentrically mounted within the die stock, for rotative movement Copies of this patent may be obtained for and engaging the wall thereof, said collar having a plurality oi spaced cylindrical sockets, and a screw threaded in 'CllQBtOCli body adapted for engagement in said sockets to secure the collar in an adjusted position within the body and maintain the pipe to be threaded at a desired inclination with relation to the longitudinal axis oi the stock.

3. The combination with a die stock hav-' mg an opening in one end of'its body eceentrically related to the periphery thereof, and means adjustably mounted in said opening and engaging the pipe or rodextending through the die stock to maintain the die stock at an inclination relative to the longitudinal. axis of said pipe or rod. I

l The combination with a die stock provided in the rear end of its bodyw'ith an eccentric opening, of a collar loosely mounted in said opening for rotative movement, said collar being also provided with an eocentric opening for the reception; of the pipe to he threaded, means mounted in the stock bony to prevent longitudinal movement of the collar therein, and additional means mounted in the stock body to secure said collar in an adjusted position within the eccentric opening ofthe body and maintain the die stock at an inclination relative to the longitudinal axis of the pipe.

5. The combination with a die stock provided in its rear end with an eccentric opening, of a collar loosely mounted in said open ing for rotative movement and-having an annular flange on one end, said; collar also having an eccentric opening for the reception of the pipe to be threaded, a plurality of screws threaded in the body of the stock to prevent longitudinal movement of the collar into the'stock body, the flange on said collar being provided a plurality of spaced sockets, and an addi tional screw threaded in the stock body for engagement in said sockets to securethe 'collar in its adjusted position and maintain the die stock at an inclination with relation to the longitudinal axis of the pipe. I

in testimony whereof I hereunto aiiiX my signature in the the presenceof two witnesses.

RICHARDANDREEVS. Witnesses O. M. DARLINGTON, JOHN H. E sner.

five cents each, by addressing the Commissioner of Patents, Washington, D. C. I

in its periphery with 

